Apparatus and methods for automatic adjustment of AV interval to ensure delivery of cardiac resynchronization therapy
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United States of America Patent
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Apr 23, 2013
Grant Date -
Jan 21, 2010
app pub date -
Jul 20, 2009
filing date -
Feb 3, 2006
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Abstract
A method of left ventricular pacing including automated adjustment of a atrio-ventricular (AV) pacing delay interval and intrinsic AV nodal conduction testing. It includes—upon expiration or reset of a programmable AV Evaluation Interval (AVEI)—performing the following: temporarily increasing a paced AV interval and a sensed AV interval and testing for adequate AV conduction and measuring an intrinsic atrio-ventricular (PR) interval for a right ventricular (RV) chamber. In the event that the AV conduction test reveals an AV conduction block condition then a pacing mode-switch to a bi-ventricular (Bi-V) pacing mode occurs and the magnitude of the AVEI is increased.
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